package org.example.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;

import java.lang.reflect.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * @author: sql
 * @date: 2024/6/7
 * @Description: 反射相关方法
 * @version: 1.0
 */
public final class ReflectUtil {

    public static final String CGLIB_CLASS_SEPARATOR = "$$";

    private static Logger logger = LoggerFactory.getLogger(ReflectUtil.class);

    /**
     * 调用Getter方法.
     */
    public static Object invokeGetterMethod(Object obj, String propertyName) {
        String getterMethodName = "get" + Func.capitalize(propertyName);
        return invokeMethod(obj, getterMethodName, new Class[]{}, new Object[]{});
    }

    /**
     * 调用Setter方法.使用value的Class来查找Setter方法.
     */
    public static void invokeSetterMethod(Object obj, String propertyName, Object value) {
        invokeSetterMethod(obj, propertyName, value, null);
    }

    /**
     * 调用Setter方法.
     *
     * @param propertyType 用于查找Setter方法,为空时使用value的Class替代.
     */
    public static void invokeSetterMethod(Object obj, String propertyName, Object value, Class<?> propertyType) {
        Class<?> type = propertyType != null ? propertyType : value.getClass();
        String setterMethodName = "set" + StringUtils.capitalize(propertyName);
        invokeMethod(obj, setterMethodName, new Class[]{type}, new Object[]{value});
    }

    /**
     * 直接读取对象属性值, 无视private/protected修饰符, 不经过getter函数.
     */
    public static Object getFieldValue(final Object obj, final String fieldName) {
        Field field = getAccessibleField(obj, fieldName);

        if (field == null) {
            throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + obj + "]");
        }

        Object result = null;
        try {
            result = field.get(obj);
        } catch (IllegalAccessException e) {
            logger.error("不可能抛出的异常{}", e.getMessage());
        }
        return result;
    }

    /**
     * 直接设置对象属性值, 无视private/protected修饰符, 不经过setter函数.
     */
    public static void setFieldValue(final Object obj, final String fieldName, final Object value) {
        Field field = getAccessibleField(obj, fieldName);

        if (field == null) {
            throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + obj + "]");
        }

        try {
            field.set(obj, value);
        } catch (IllegalAccessException e) {
            logger.error("不可能抛出的异常:{}", e.getMessage());
        }
    }

    /**
     * 循环向上转型, 获取对象的DeclaredField, 并强制设置为可访问.
     * <p>
     * 如向上转型到Object仍无法找到, 返回null.
     */
    public static Field getAccessibleField(final Object obj, final String fieldName) {
        AssertUtils.notNull(obj, "object不能为空");
        AssertUtils.hasText(fieldName, "fieldName");
        for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass.getSuperclass()) {
            try {
                Field field = superClass.getDeclaredField(fieldName);
                field.setAccessible(true);
                return field;
            } catch (NoSuchFieldException e) {//NOSONAR
                // Field不在当前类定义,继续向上转型
            }
        }
        return null;
    }

    /**
     * 对于被cglib AOP过的对象, 取得真实的Class类型.
     */
    public static Class<?> getUserClass(Class<?> clazz) {
        if (clazz != null && clazz.getName().contains(CGLIB_CLASS_SEPARATOR)) {
            Class<?> superClass = clazz.getSuperclass();
            if (superClass != null && !Object.class.equals(superClass)) {
                return superClass;
            }
        }
        return clazz;
    }

    /**
     * 直接调用对象方法, 无视private/protected修饰符. 用于一次性调用的情况.
     */
    public static Object invokeMethod(final Object obj, final String methodName, final Class<?>[] parameterTypes, final Object[] args) {
        Method method = getAccessibleMethod(obj, methodName, parameterTypes);
        if (method == null) {
            throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + obj + "]");
        }

        try {
            return method.invoke(obj, args);
        } catch (Exception e) {
            throw convertReflectionExceptionToUnchecked(e);
        }
    }

    /**
     * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问. 如向上转型到Object仍无法找到, 返回null.
     * <p>
     * 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
     */
    public static Method getAccessibleMethod(final Object obj, final String methodName, final Class<?>... parameterTypes) {
        AssertUtils.notNull(obj, "object不能为空");

        for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass.getSuperclass()) {
            try {
                Method method = superClass.getDeclaredMethod(methodName, parameterTypes);

                method.setAccessible(true);

                return method;

            } catch (NoSuchMethodException e) {//NOSONAR
                // Method不在当前类定义,继续向上转型
            }
        }
        return null;
    }

    /**
     * 通过反射, 获得Class定义中声明的父类的泛型参数的类型. 如无法找到, 返回Object.class. eg. public UserDao extends HibernateDao<User>
     *
     * @param clazz The class to introspect
     * @return the first generic declaration, or Object.class if cannot be determined
     */
    public static <T> Class<T> getSuperClassGenricType(final Class clazz) {
        return getSuperClassGenricType(clazz, 0);
    }

    /**
     * 通过反射, 获得Class定义中声明的父类的泛型参数的类型. 如无法找到, 返回Object.class.
     * <p>
     * 如public UserDao extends HibernateDao<User,Long>
     *
     * @param clazz clazz The class to introspect
     * @param index the Index of the generic ddeclaration,start from 0.
     * @return the index generic declaration, or Object.class if cannot be determined
     */
    public static Class getSuperClassGenricType(final Class clazz, final int index) {

        Type genType = clazz.getGenericSuperclass();

        if (!(genType instanceof ParameterizedType)) {
            logger.warn(clazz.getSimpleName() + "'s superclass not ParameterizedType");
            return Object.class;
        }

        Type[] params = ((ParameterizedType) genType).getActualTypeArguments();

        if (index >= params.length || index < 0) {
            logger.warn("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: " + params.length);
            return Object.class;
        }
        if (!(params[index] instanceof Class)) {
            logger.warn(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
            return Object.class;
        }

        return (Class) params[index];
    }

    /**
     * 将反射时的checked exception转换为unchecked exception.
     */
    public static RuntimeException convertReflectionExceptionToUnchecked(Exception e) {
        if (e instanceof IllegalAccessException || e instanceof IllegalArgumentException || e instanceof NoSuchMethodException) {
            return new IllegalArgumentException("Reflection Exception.", e);
        } else if (e instanceof InvocationTargetException) {
            return new RuntimeException("Reflection Exception.", ((InvocationTargetException) e).getTargetException());
        } else if (e instanceof RuntimeException) {
            return (RuntimeException) e;
        }
        return new RuntimeException("Unexpected Checked Exception.", e);
    }

    public static List<Field> getDeclaredFields(final Class beanClass) {
        final List<Field> fields = new ArrayList<Field>();

        Class classToProcess = beanClass;
        do {
            fields.addAll(Arrays.asList(classToProcess.getDeclaredFields()));
            classToProcess = classToProcess.getSuperclass();
        } while (classToProcess != null);

        return fields;
    }

    public static List<Method> getMethods(final Class beanClass) {
        return Arrays.asList(beanClass.getMethods());
    }

    public static void setFieldValue(final Object bean, final Field field, final Object value) {
        boolean isAccessible = field.isAccessible();

        try {
            if (!isAccessible) {
                field.setAccessible(true);
            }

            try {
                field.set(bean, value);
            } catch (IllegalAccessException e) {
                throw new IllegalStateException(e);
            }

        } finally {
            if (!isAccessible) {
                field.setAccessible(isAccessible);
            }
        }
    }

    public static Object invokeMethod(final Object bean, final Method method, final Object... args) {
        try {

            return method.invoke(bean, args);

        } catch (IllegalAccessException | InvocationTargetException e) {
            throw new IllegalStateException(e);
        }
    }

    /**
     * 通过定义的字段查找 getter 方法
     *
     * @param field
     * @return
     */
    public static Method getterMethod(Class<?> clazz, Field field) {
        Method method = null;
        if (clazz != null && field != null) {
            String name = "get" + field.getName().substring(0, 1).toUpperCase()
                    + field.getName().substring(1);
            try {
                method = clazz.getDeclaredMethod(name, new Class<?>[]{});
            } catch (NoSuchMethodException | SecurityException ignored) {
            }

            //boolean 类型如果没有 getXXX 方法，尝试 isXXX 方法
            if (isBoolean(field) && method == null) {
                name = "is" + field.getName().substring(0, 1).toUpperCase()
                        + field.getName().substring(1);

                try {
                    method = clazz.getDeclaredMethod(name, new Class<?>[]{});
                } catch (NoSuchMethodException | SecurityException ignored) {
                }
            }

        }
        return method;
    }

    /**
     * 判断字段是否为 boolean 类型
     *
     * @param field
     * @return
     */
    public static boolean isBoolean(Field field) {
        return isBoolean(field.getGenericType());
    }

    /**
     * 判断是否为 boolean 类型
     *
     * @param type
     * @return
     */
    public static boolean isBoolean(Type type) {
        String s = type.toString().toLowerCase();
        return s.contains("boolean") || s.contains("Boolean");
    }

    /**
     * 通过字段名获取字段
     *
     * @param clazz
     * @param fieldName
     * @return
     */
    public static Field getField(Class<?> clazz, String fieldName) {
        try {
            return clazz.getDeclaredField(fieldName);
        } catch (NoSuchFieldException | SecurityException ignored) {
        }
        return null;
    }
}
